simplify infered filters.

Author: jiangxb1987

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/InferFiltersFromConstraintsSuite.scala

@@ -32,7 +32,9 @@ class InferFiltersFromConstraintsSuite extends PlanTest {
         PushPredicateThroughJoin,
         PushDownPredicate,
         InferFiltersFromConstraints,
-        CombineFilters) :: Nil
+        CombineFilters,
+        SimplifyBinaryComparison,
+        BooleanSimplification) :: Nil
   }
 
   val testRelation = LocalRelation('a.int, 'b.int, 'c.int)
@@ -169,13 +171,13 @@ class InferFiltersFromConstraintsSuite extends PlanTest {
           && "t.int_col".attr === "t2.a".attr))
       .analyze
     val correctAnswer = t1.where(IsNotNull('a) && IsNotNull(Coalesce(Seq('a, 'a)))
-      && 'a === Coalesce(Seq('a, 'a)) && 'a <=> Coalesce(Seq('a, 'a)) && 'a <=> 'a
+      && 'a === Coalesce(Seq('a, 'a)) && 'a <=> Coalesce(Seq('a, 'a))
       && 'a === 'b && IsNotNull(Coalesce(Seq('a, 'b))) && 'a === Coalesce(Seq('a, 'b))
       && IsNotNull('b) && IsNotNull(Coalesce(Seq('b, 'b)))
-      && 'b === Coalesce(Seq('b, 'b)) && 'b <=> Coalesce(Seq('b, 'b)) && 'b <=> 'b)
+      && 'b === Coalesce(Seq('b, 'b)) && 'b <=> Coalesce(Seq('b, 'b)))
       .select('a, 'b.as('d), Coalesce(Seq('a, 'b)).as('int_col)).as("t")
       .join(t2.where(IsNotNull('a) && IsNotNull(Coalesce(Seq('a, 'a)))
-      && 'a === Coalesce(Seq('a, 'a)) && 'a <=> Coalesce(Seq('a, 'a)) && 'a <=> 'a), Inner,
+      && 'a === Coalesce(Seq('a, 'a)) && 'a <=> Coalesce(Seq('a, 'a))), Inner,
         Some("t.a".attr === "t2.a".attr
           && "t.d".attr === "t2.a".attr
           && "t.int_col".attr === "t2.a".attr))